diff --git a/mastus/radicale.nix b/mastus/radicale.nix
index 9f020a5..14c9774 100644
--- a/mastus/radicale.nix
+++ b/mastus/radicale.nix
@@ -64,6 +64,10 @@ in
         proxy_set_header Host $http_host;
         proxy_redirect off;
         proxy_buffering off;
+        proxy_connect_timeout       900;
+        proxy_send_timeout          900;
+        proxy_read_timeout          900;
+        send_timeout                900;
         proxy_pass http://radicale;
         client_max_body_size 30M;
         break;